Sync per-pose index and locomotion state across the network

Add PlayerAnimationSync NetworkBehaviour with owner-authoritative
NetworkVariables for pose index and locomotion category (idle/walk/run/fall).
Remote avatars switch their PlayerPoseController into network-controlled mode,
skipping local input, sprint reset, capsule resize and camera framing, and
take pose index plus locomotion externally. Disable pose persistence on
network-driven remotes so foreign avatars can't overwrite the local save.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Prefabs/Player.prefab

@@ -48,6 +48,7 @@ GameObject:
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   - component: {fileID: 6847253018511389861}
   - component: {fileID: 8574096554986372233}
+  - component: {fileID: 8646586982149381366}
   m_Layer: 0
   m_Name: Player
   m_TagString: Player
@@ -296,6 +297,19 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: Assembly-CSharp::NetworkPlayerSetup
   ShowTopMostFoldoutHeaderGroup: 1
+--- !u!114 &8646586982149381366
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 5384024074013944205}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 8c52bb7282c319e4f8c1f956d17cbdca, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Assembly-CSharp::PlayerAnimationSync
+  ShowTopMostFoldoutHeaderGroup: 1
 --- !u!1 &6840099669803454162
 GameObject:
   m_ObjectHideFlags: 0